I'm an associate professor at a university in Japan, and last year I discovered that my university has two working, vintage Sony DXC-M3A Saticon tube video cameras, along with accompanying power supplies and CCU-M3 camera control units (CCUs).
I'm trying to build a video cable that will run from the RGB+CSync BNC outputs on a CCU to the SCART input on a SCART->HDMI upscaler that I recently purchased. The goal is to get RGB output from the cameras into an Elgato Game Capture HD, which is very picky about which resolutions it accepts through HDMI.
The CCUs output RGB+CSync through four independent 75-ohm BNC plugs. Right now I have a BNC->VGA/15-pin RGB cable, and I was able to use that cable with a Gonbes arcade scaler to get an RGB signal to an LCD monitor, but not into the capture device. I wired my own VGA->SCART cable to go from that cable to the SCART->HDMI scaler, but all I ended up with was a blank screen.
I have some RCA plug to BNC adapters, so I was thinking of cutting off one end of an AV cable (plus one more RCA cable), wiring the ends to the appropriate SCART pins, and then connecting the other end (RGB+CSync) to the CCU, but which pins should I use? Do I need to use a power supply to send the correct blanking signals and aspect ratio selection to the SCART end?
I'd appreciate any advice the StackExchange masses can give me.